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SOHC - Mutha' Thumpr NSR (No Springs Required): Very rough idle, biggest cam for stock heads. Great power above 4900 rpm. Compatible with stock valve springs, benefits from converter and gears, requires cam phaser upgrade and custom tuning. COMP Cams Thumpr NSR (NO SPRINGS REQUIRED) MT273LL-9 Camshaft Set for 4.6L and 5.4L SOHC Modular 3 Valve Ford SOHC - Mutha' Thumpr NSR (No Springs Required): Very rough idle, biggest cam for stock heads. Great power above 4900 rpm. Compatible with stock valve springs, benefits from converter and gears, requires cam phaser upgrade and custom tuning.; 273/306 Advertised Duration, 234/254 Duration .050", .450"/.450" Lift, 109 Lobe Separation; Part #26113-24 valve springs available but not required; Steel retainer part #710-24 and titanium retainer part #702-24 also available; Ford: Lobo 04 - 10 4.6 L Engine, Ford: Explorer Sport Trac 07 - 10 4.6 L Engine, Ford: Lobo 04 - 10 5.4 L Engine, Ford: F-150 09 - 10 4.6 L Engine, Ford: Expedition 04 - 04 4.6 L Engine, Ford: F-250 04 - 09 4.6 L Engine, Mercury: Mountaineer 06 - 10 4.6 L Engine, Ford: Expedition 05 - 14 5.4 L Engine, Lincoln: Navigator 05 - 14 5.4 L Engine, Ford: Mustang 04 - 10 4.6 L Engine, Ford: Grand Marquis 04 - 04 4.6 L Engine, Ford: Econoline 04 - 06 4.6 L Engine, Ford: F-250 Super Duty 05 - 10 5.4 L Engine, Ford: F-150 04 - 10 5.4 L Engine, Lincoln: Mark LT 06 - 10 5.4 L Engine, Ford: F-350 Super Duty 05 - 10 5.4 L Engine, Avanti: Avanti 05 - 07 4.6 L Engine, Ford: Explorer 04 - 10 4.6 L Engine
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